Utah Comparative Fault & Crash Liability

Sources checked: October 23, 2026. Utah separates the amount of damages, the allocation of fault and the amount each defendant may owe. Identify everyone whose conduct may matter before reducing the claim to a single percentage.

Recovery requires the other included fault to exceed yours

Utah Code 78B-5-818(2) permits recovery from a defendant or group of defendants when their fault, combined with the fault allocated to immune persons and nonparties, exceeds the claimant’s fault. The statute makes that comparison before the immune-party reallocation described in section 78B-5-819(2).

In a simple two-person crash with no other allocated fault, this means the claimant must be less than 50% at fault. A 50/50 division does not satisfy the “exceeds” requirement. In a multi-person case, compare the categories the statute includes; do not compare the claimant only against one defendant while ignoring everyone else.

Fault is broader than an insurer’s label

Section 78B-5-817 defines fault through actionable breaches of legal duty, acts or omissions that proximately cause or contribute to injury or damage. Its definition includes negligence and certain other theories, including product liability. Allocation requires a factual and legal basis, not simply naming another person.

Keep a record for each potentially responsible driver, vehicle owner, employer or other actor. Preserve photographs, original video, witness contact details, vehicle information and the crash report. Separate firsthand observations from estimates and later opinions about speed, visibility or the opportunity to avoid the collision.

Several liability usually ties payment to each defendant’s share

Under section 78B-5-818(3) and section 78B-5-820, a defendant’s liability is generally limited to the proportion of damages corresponding to that defendant’s allocated fault. One defendant is not automatically responsible for every other person’s share.

• Simple illustration: With $100,000 in damages, 20% claimant fault and 80% defendant fault, the defendant’s allocated share would be $80,000.
• Two defendants: With the same damages and 20% claimant fault, allocations of 30% to defendant A and 50% to defendant B would correspond to $30,000 and $50,000 respectively.
• Equal fault: In an otherwise simple 50/50 claimant-versus-defendant case, the statutory recovery threshold is not met.

These examples assume the stated allocations and omit immunity, settlements, coverage limits, collectibility and other legal adjustments. They explain arithmetic, not the likely outcome of a claim.

Immune parties create a separate reallocation issue

Section 78B-5-817(3) defines the immune persons covered by these provisions, including qualifying employers under workers’ compensation law and qualifying governmental entities or employees. Whether immunity actually applies must be determined under the governing law.

Section 78B-5-819(2) directs reallocation when the combined fault assigned to immune persons is less than 40%. It reduces that immune share to zero and reallocates it proportionately among the other included persons with an adequate factual and legal basis. If the combined immune share is 40% or more, that reduction does not occur under subsection (2)(a).

The statute also limits what the jury may be told about reallocation. Allocation does not itself make an immune person liable. Do not use a simple two-driver calculator for a case involving these provisions without reviewing the initial allocation and the required reallocation separately.

Nonparty allocation requires timely identification and support

Section 78B-5-821(4) conditions allocation to a nonparty on a timely filing describing the factual and legal basis and identifying information to the extent known or reasonably available. It refers to Utah Rule of Civil Procedure 9 and court orders. Treat this as a litigation procedure requiring an exact deadline check; a name in a claim letter is not a substitute for the required filing.

For an unidentified vehicle, section 78B-5-818(4)(a) requires clear and convincing evidence that the vehicle existed and permits that proof to consist solely of one person’s testimony. Preserve the details promptly; do not assume that a missing plate number automatically resolves the issue.

Keep tort fault, damages and coverage questions separate

Ask the insurer to explain the conduct attributed to each person and the evidence supporting it. Keep medical, income and property-loss records in a separate damages file. PIP, UM/UIM, policy limits and settlement effects involve additional rules; an allocation in a tort claim does not by itself resolve all insurance benefits.

Scope: This guide explains the stated provisions of sections 78B-5-817 through 78B-5-821. It does not determine an individual allocation, resolve every immunity or vicarious-liability issue, or replace review of court rules, controlling decisions and historical law applicable to a particular event.